k3s/pkg/rootlessports/controller.go

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//go:build !windows
// +build !windows
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package rootlessports
import (
"context"
"time"
"github.com/k3s-io/k3s/pkg/rootless"
coreClients "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
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"github.com/rootless-containers/rootlesskit/pkg/api/client"
"github.com/rootless-containers/rootlesskit/pkg/port"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
)
var (
all = "_all_"
)
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func Register(ctx context.Context, serviceController coreClients.ServiceController, enabled bool, httpsPort int) error {
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var (
err error
rootlessClient client.Client
)
if rootless.Sock == "" {
return nil
}
for i := 0; i < 30; i++ {
rootlessClient, err = client.New(rootless.Sock)
if err == nil {
break
} else {
logrus.Infof("Waiting for rootless API socket %s: %v", rootless.Sock, err)
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time.Sleep(1 * time.Second)
}
}
if err != nil {
return err
}
h := &handler{
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enabled: enabled,
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rootlessClient: rootlessClient,
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serviceClient: serviceController,
serviceCache: serviceController.Cache(),
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httpsPort: httpsPort,
ctx: ctx,
}
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serviceController.OnChange(ctx, "rootlessports", h.serviceChanged)
serviceController.Enqueue("", all)
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return nil
}
type handler struct {
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enabled bool
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rootlessClient client.Client
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serviceClient coreClients.ServiceController
serviceCache coreClients.ServiceCache
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httpsPort int
ctx context.Context
}
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func (h *handler) serviceChanged(key string, svc *v1.Service) (*v1.Service, error) {
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if key != all {
h.serviceClient.Enqueue("", all)
return svc, nil
}
ports, err := h.rootlessClient.PortManager().ListPorts(h.ctx)
if err != nil {
return svc, err
}
boundPorts := map[int]int{}
for _, port := range ports {
boundPorts[port.Spec.ParentPort] = port.ID
}
toBindPort, err := h.toBindPorts()
if err != nil {
return svc, err
}
for bindPort, childBindPort := range toBindPort {
if _, ok := boundPorts[bindPort]; ok {
logrus.Debugf("Parent port %d to child already bound", bindPort)
delete(boundPorts, bindPort)
continue
}
status, err := h.rootlessClient.PortManager().AddPort(h.ctx, port.Spec{
Proto: "tcp",
ParentPort: bindPort,
ChildPort: childBindPort,
})
if err != nil {
return svc, err
}
logrus.Infof("Bound parent port %s:%d to child namespace port %d", status.Spec.ParentIP,
status.Spec.ParentPort, status.Spec.ChildPort)
}
for bindPort, id := range boundPorts {
if err := h.rootlessClient.PortManager().RemovePort(h.ctx, id); err != nil {
return svc, err
}
logrus.Infof("Removed parent port %d to child namespace", bindPort)
}
return svc, nil
}
func (h *handler) toBindPorts() (map[int]int, error) {
svcs, err := h.serviceCache.List("", labels.Everything())
if err != nil {
return nil, err
}
toBindPorts := map[int]int{
h.httpsPort: h.httpsPort,
}
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if !h.enabled {
return toBindPorts, nil
}
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for _, svc := range svcs {
for _, ingress := range svc.Status.LoadBalancer.Ingress {
if ingress.IP == "" {
continue
}
for _, port := range svc.Spec.Ports {
if port.Protocol != v1.ProtocolTCP {
continue
}
if port.Port != 0 {
if port.Port <= 1024 {
toBindPorts[10000+int(port.Port)] = int(port.Port)
} else {
toBindPorts[int(port.Port)] = int(port.Port)
}
}
}
}
}
return toBindPorts, nil
}